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@PHDTHESIS{KlabbersHeimann:32188,
      author       = {Klabbers-Heimann, Jürgen Johannes},
      title        = {{A}nwendungsgrenzen von modernen
                      {N}ickelbasis-{S}uperlegierungen in effusionsgekühlten
                      {B}auteilen zukünftiger {G}asturbinen},
      volume       = {4067},
      issn         = {0944-2952},
      school       = {Techn. Hochsch. Aachen},
      type         = {Dr. (FH)},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-32188, Juel-4067},
      series       = {Berichte des Forschungszentrums Jülich},
      pages        = {135 p.},
      year         = {2003},
      note         = {Record converted from VDB: 12.11.2012; Aachen, Techn.
                      Hochsch., Diss., 2003},
      abstract     = {The deformation and damage behaviour of two nickel-base
                      superalloys, CMSX-4 and SX CM186LC, have been investigated.
                      Hot-tensile, tensile creep and low-cycle-fatigue tests have
                      been performed on single crystal and directionally
                      solidified variants at temperatures up to 1000°C to compare
                      their tensile-, creep- and fatigue behaviour. The strength
                      and fatigue properties of both materials were significantly
                      influenced by their different microstructures. Comparing the
                      single crystal materials, CMSX-4 exhibited in strain rate
                      controlled tensile tests (1000°C) higher strength
                      properties than SX CM186LC. The heterogeneity of the
                      microstructure development of SX CM186LC favoured crack
                      initiation and explains the worse fatigue behaviour. Crack
                      growth followed mainly in the interdendritic regions. In the
                      temperature range of 750 to 1000°C, the creep resistance of
                      SX CM186LC was lower than that of CMSX-4. In isothermal
                      fatigue tests the advantage of the single crystal variants
                      compared to the directionally solidified variants was
                      demonstrated. Bond coating of MCrAlY on single crystal
                      specimens seemed to have a positive effect on life time
                      compared to directionally solidified variants. The
                      difference in the materials behaviour could be clearly
                      demonstrated by a comparison between the homogeneous
                      microstructure of CMSX-4 and the heterogeneous
                      microstructure of SX CM186LC. Based on some oxidation test
                      results mentioned in the open literature together with
                      isothermal oxidation tests carried out in a temperature
                      range of 550 to 1000°C, CMSX-4 exhibited good oxidation
                      resistance, which meant that the cooling channels
                      (drillings) did not close up due to oxide scale formation.
                      Principally this work concentrated on the set-up and testing
                      method for in-situ investigations in the scanning electron
                      microscope (SEM). In-situ investigations in the SEM were
                      carried out to obtain a description of micro-crack (smaller
                      than 100 mm) initiation and growth, starting from laser
                      drilled cooling channels. The development of the SEM
                      investigation showed that crack initiation started mainly at
                      the base of the drilling, crack propagation appeared to be
                      perpendicular to the main load stress direction and crack
                      growth ran along the cooling channels located perpendicular
                      to the main load. In-situ testing in the SEM represents a
                      new testing method. The results which described the material
                      behaviour could be used in the evaluation of the operational
                      limits of effusion cooled components in modern industrial
                      gas turbines.},
      cin          = {IWV-2},
      cid          = {I:(DE-Juel1)VDB2},
      pnm          = {Werkstoffsysteme für Kraftwerke},
      pid          = {G:(DE-Juel1)FUEK248},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/32188},
}